Improvement in devices for increasing and decreasing the speed of driven shafts



L. WRIGHT. Improvement in Device for Increasing and Decreasing the Speedof Driven Shafts.

No.128,773. Patentedjuly 9,182'2.

wfiNEssEs \NVENTOR 526M046 embodying my invention.

the same, viewing it from above.

UNITED STATES PATENT QFFICE.

L Y SANDER WRIGHT, OF NEWARK, NEW JERSEY, ASSIGN OR TO HIMSELF ANDCHARLES B. SMITH, OF SAME PLACE.

IMPROVEMENT lN DEVICES FOR INCREASING AND DECREASING THE SPEEll 0FDRIVEN SHAFTS.

Specification forming part of Letters Patent No. 128,773, dated July 9,1872.

SPECIFICATION.

I, LYSANDER WRIGHT, of the city of Newark, in the county of Essex andState of New Jersey, have invented certain Improvements in the Method ofIncreasing and Decreasing the Speed of Driven Shafts, of which thefollowing is a specification:

Nature and Objects of the Invention.

The object desired in my invention is to so cure a simple device, freefrom complication, by which a positive motion may be secured, which willallow of a change in the speed of a shaft to be driven within widelimits.

Description of the Accompanying Drawing.

' Figure 1 is a side elevation of a machine Fig. 2 is a plan of GeneralDescription.

In constructing my device I use two disks or face-plates, as shown inthe drawing at B and O, which disks have their faces rounded slightlyfrom the center outward. The disk B is represented as attached to thepulley F with a connection to a shaft having bearings at E E, andreceives the power applied at H. The disk G is attached to the pulley G,in connection with a shafthaving bearings. at E and E" which bearingsrest in the adj ustable frame D. The frame D is held by a pivot at I,and is arranged to move freely in the direction shown by the arrow at K.

In the operation of my device it can readily be seen that when the diskG is brought in con tact with the disk B,when the adjustable frame D isthrown to the extreme right, the point of contact in the two disks willbe very near the center of the diskB, as shown at L. The disk B beingrotated ata given speed, the circumference at L would represent onlyabout onethird of that of the disk 0, and, consequently, the revolutionsof the latter would be only in that proportion. A spring shown at Jholds the adjustable frame D firmly to its place, thus giving sufficientfriction on the disks to transmit power from one to the other. When theadjustable frame D is moved to the extreme left in the direction of thearrow at K, the point of contact of the two disks would be an equivalentpoint on the disk 0, as shown on the disk B at L, in that case makingthe circumference at the point of contact of the disk 0 only aboutone-third of that of the disk B at the same point, thus causing therevolutions of the disk 0 to be about three times those of the disk 13,and the proportion of the revolutions of the two disks would be changedas the point of contact is changed within these limits by the movementsof the adjustable frame D, thus securing a very wide range in the speedsof the two by'a slight movement of the frame D. One of the disks may bestraight on its face, if desired, and the same object would beaccomplished.

Having thus described my invention, what I desire to secure by LettersPatent, is-

1. The laterally-adjustable frame D, in combination with the adjustabledisk 0, substantially as described, and operating as and for thepurposes set forth.

2. I claim the combination of the disks B and G, with thelaterally-adjustable frame D, constructed as described, and operating asand for the purposes set forth.

' LYSANDER WRIGHT.

Witnesses:

DANIEL F. OoLIE, J. W. SMITH.

